Charging System with Refrigerant

Parent topic: Refrigeration Maintenance

Unit Charging by Weight (from an Evacuated Condition)

  1. Close valve V4.

  2. Open the gas ballast valve (located on top of the pump housing behind the handle).

  3. Stop the vacuum pump.

  4. Mid-seat the discharge valve.

  5. Connect the refrigerant tank with gauge manifold to the evacuation station (Refer to Unit Preparation and Hookup).

  6. Weigh the tank of refrigerant.

  7. Check the unit data plate for the required weight of refrigerant charge. Subtract the amount of the charge to be input to your unit from the total weight of the tank of refrigerant. This provides final tank weight after the unit receives a full system refrigerant charge.

  8. Set the refrigerant tank for liquid removal. Open the hand valve on the tank.

  9. Turn the unit off.

  10. Open the gauge manifold hand valve and charge liquid refrigerant into the system.

  11. Close the refrigerant tank hand valve when the correct amount (by weight) of refrigerant has been added or if the system will take no more liquid. The unit is now ready to have the evacuation station removed.

Evacuation Station Removal

  1. Back seat the discharge service valves.

  2. Close the high pressure hand valve on the gauge manifold.

  3. Close the refrigerant tank hand valve.

  4. Open the hand valve at the gauge manifold and read suction pressure.

  5. Operate the unit in Cool mode until the suction pressure decreases below 385 kPa, 3.85 bar, 50 psig.

  6. Back seat the suction line access service valve.

  7. Stop the unit.

  8. Remove the hoses from the suction and discharge line access service valves.

  9. Start the unit and perform a controller pretrip test to verify correct refrigerant charge and unit operation.